A system for controlling the distribution and use of digital works (101) using digital tickets. In the present invention, a "digital ticket" is used to entitle the ticket holder to exercise some usage right (102) with respect to a digital work. Usage rights are used to define how a digital work may be...http://www.google.fr/patents/EP1349041A3?cl=fr&utm_source=gb-gplus-shareBrevet EP1349041A3 - Système pour commander la distribution et l'utilisation d'oeuvres numériques utilisant des tickets numériques